METTLER TOLEDO FiveEasyPlus™ Benchtop Conductivity Meter

Overview

The METTLER TOLEDO FiveEasyPlus™ Benchtop Conductivity Meter is an entry-level yet rigorously engineered electrochemical instrument designed for routine conductivity, salinity, and TDS measurements in regulated laboratory environments. Based on four-electrode or two-electrode AC conductometric principles—depending on the selected sensor—it delivers stable, drift-resistant readings across a broad dynamic range (0.01 µS/cm to 500 mS/cm), covering ultrapure water analysis through high-ionic-strength industrial process streams. Its temperature-compensated measurement architecture adheres to standard linear compensation models per ISO 7888 and ASTM D1125, supporting dual reference temperatures (20 °C and 25 °C) and user-definable compensation coefficients (0.00–10.00 %/°C). Engineered in Switzerland and assembled under strict quality control, the instrument meets fundamental requirements for traceable, repeatable electrochemical characterization in QC labs, environmental testing facilities, and academic teaching laboratories.

Key Features

• Intuitive, GLP-Ready Operation: Large backlit LCD display presents real-time conductivity, temperature, salinity, TDS, electrode status, and calibration validity—all in a single view. Icon-driven menu navigation minimizes training time and reduces operator error.
• Compact, Space-Efficient Design: Minimal footprint (W × D × H: 190 × 200 × 80 mm) allows integration into crowded benchtop setups. Integrated electrode holder retracts flush against the instrument body when not in use—eliminating clutter and preventing accidental damage.
• Dual-Interface Data Connectivity: RS232 and USB ports enable direct export of measurement logs and calibration reports to printers or PCs without proprietary software. Output format is plain ASCII, compatible with LIMS, Excel, and validated data review systems.
• Robust Calibration Management: Stores full calibration history—including date/time stamp, standard values used (e.g., 1413 µS/cm and 12.88 mS/cm KCl standards), slope, offset, and sensor ID—for up to 200 measurements. Supports 1- or 2-point calibration with automatic recognition of standard values.
• Integrated Sensor Support: Ships with the LE703 universal conductivity cell (cell constant k = 0.1 cm⁻¹), optimized for low-to-mid range applications (0.01 µS/cm–20 mS/cm). Optional electrodes—including k = 1.0 cm⁻¹ and k = 10 cm⁻¹ cells—are field-replaceable and auto-recognized via plug-and-play interface.

Sample Compatibility & Compliance

The FiveEasyPlus™ is validated for aqueous solutions only, including drinking water, wastewater, boiler feedwater, pharmaceutical buffers, and saline media. It does not support non-aqueous, viscous, or highly particulate samples without filtration or dilution. All measurements comply with ISO 7888 (electrical conductivity of water), ASTM D1125 (standard test method for electrical conductivity of water), and USP (water conductivity). The instrument supports manual documentation of calibration and measurement metadata required under GLP and ISO/IEC 17025 accreditation frameworks. While not natively 21 CFR Part 11 compliant, its ASCII data export enables integration into validated electronic lab notebook (ELN) or LIMS platforms with full audit trail capabilities.

Software & Data Management

No dedicated PC software is required. Measurement data—including timestamp, parameter values, temperature, electrode ID, and calibration parameters—is stored internally and exported as tab-delimited text files via USB mass storage mode or RS232 serial dump. Each record includes a unique identifier and checksum for integrity verification. Calibration events are logged with full traceability: standard lot numbers, ambient conditions (if entered manually), and operator ID fields can be appended during setup. Exported files conform to FAIR data principles (Findable, Accessible, Interoperable, Reusable) and integrate seamlessly with statistical process control (SPC) tools and automated reporting pipelines.

Applications

• Quality control of purified water (PW) and water-for-injection (WFI) in pharmaceutical manufacturing per USP and EP 2.2.38.
• Routine monitoring of conductivity in municipal drinking water treatment plants and wastewater effluent discharge compliance (e.g., EPA Method 120.1).
• Salinity determination in marine biology and aquaculture studies (0.00–42 psu range aligned with PSS-78 standard).
• TDS estimation in food & beverage production, including brewing, dairy processing, and soft drink formulation.
• Electrolyte concentration verification in battery electrolyte R&D and fuel cell membrane hydration studies.
• Teaching core electrochemical concepts—including cell constant derivation, temperature compensation modeling, and conductivity–resistivity conversion—in undergraduate chemistry and environmental science labs.

FAQ

What is the minimum detectable conductivity value?
The instrument resolves down to 0.01 µS/cm with a stated accuracy of ±0.5% of reading above 100 µS/cm, and ±0.01 µS/cm absolute below that threshold.
Can the FiveEasyPlus™ perform automatic temperature compensation without manual input?
Yes—when paired with the integrated Pt1000 temperature sensor (built into LE703), it applies linear compensation automatically using user-selected reference temperature and coefficient.
Is calibration traceable to national standards?
Calibration relies on certified KCl standards (e.g., 1413 µS/cm at 25 °C, NIST-traceable); instrument validation requires external verification using accredited reference materials.
Does it support password-protected user levels?
No—the FiveEasyPlus™ does not include role-based access control; configuration changes require physical button interaction and are not secured.
Can I use third-party conductivity cells?
Only METTLER TOLEDO–certified electrodes with digital identification chips are guaranteed for full functionality, including auto-cell-constant recognition and diagnostics.